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CI-v4.1 EQc7:Daylight

Film installed in glazing partitions

We're working on a project that will install a film on indoor glazing partitions for privacy purposes in meeting rooms and some private offices.

1) Do we have to include this film within our daylight model?

2) Is there a min/max threshold which defines when we have to acknowledge (or not) this film in the glazing partitios of our model?

Thank you,

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Mon, 03/20/2023 - 23:40

Hi, if the film just lowers the VT,  you can approximate it by lowering the VT of the glass its being placed on (e.g. 80% transparent film on 60% glass ~ 48% VT glass).  According to LM-83-12, p 8, 5% accuracy is asked for in these models. Good luck!

Tue, 03/21/2023 - 17:55

This would mean that the glazing portion of the film will have ~48% of the glazing’s VT. If my glazing has 84VT, the total assembly would be ~62VT? 48%*84VT=40VT (Film portion)  (40VT+84VT)/2= 62VT

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